book Maths Puzzle Numerical Ability

Subtract and simplify:

2/x^2 + 6x - 27 minus 1/x^2 + 12x + 27

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book Other Question

FIND TWO CONSECUTIVE WHOLE NUMBERS SUCH THAT THE SUM OF THEIR SQUARES IS 145. What are the steps in adding, subtracting, multiplying, and dividing these problems:
f(x)=3x^2+4x-5
g(x)=2x+9

&

f(x)=x/x+1
g(x)=x^2-1